For many deliverable quest items, after delivering them to the NPC required you can steal the item back. This isn't possible however in the delivery quest from Banning to Voada, where you must deliver Spiced Meat to Voada. After finishing the quest, the item is simply gone from Voada's inventory.
Turning off USSEP does not have this issue, the item only disappears while USSEP is active.
(there's at least one other item with the same issue, but I can't seem to remember which)